研究目的
To visualize how optical fields are distributed when multiple modes interfere within a silver disk nano antenna and to demonstrate the direct connection of the resonance phase, nanoscale field distribution and directionality, based on interference of eigen modes.
研究成果
The study demonstrated nanoscale visualization of low-Q mode interferences by angle- and polarization- resolved cathodoluminescence method. The optical hotspots resulting from the interference of different modes appear in different locations depending on the energy, angle and polarization. Controlling the interference of the existing mode as well as its phase is beneficial for energy conversions such as photovoltaics or photocatalysis.
研究不足
The study deals with interferences of the existent modes in a fixed structure, and not the coupling creating new modes in a new structure such as hybridization.
1：Experimental Design and Method Selection:
Angle- and polarization-resolved cathodoluminescence based on scanning transmission electron microscopy was used to select specific modes and visualize the field distribution at the nanoscale.
2：Sample Selection and Data Sources:
Silver nanodisks on a free-standing SiO2 membrane were used as nanoantennas.
3：List of Experimental Equipment and Materials:
Modified JEM-2100F (JEOL, Japan) with a Cs-corrector, acceleration voltage of 80 kV, electron probe current of about 1 nA with about 20 mrad illumination half angle.
4：Experimental Procedures and Operational Workflow:
The photon maps are obtained by collecting the optical spectrum at each electron beam position, synchronized with the electron beam scan.
5：Data Analysis Methods:
The cathodoluminescence signals were modeled as superpositions of analytical eigen mode functions consisting of multipoles in space and complex Lorentzians in frequency.
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